Cutaneous and pulmonary reactivity in cholinergic urticaria

Area of Science:

• Immunology
• Dermatology
• Pulmonology

Background:

• Cholinergic urticaria (CU) is a condition characterized by hives triggered by increased body temperature.
• Understanding the underlying mechanisms of CU, particularly skin and airway responses, is crucial for effective management.

Purpose of the Study:

• To investigate and compare cutaneous and pulmonary reactions to inflammatory mediators in patients with cholinergic urticaria, other urticaria types, and healthy controls.
• To determine if there is a correlation between skin and airway reactivity in these groups.

Main Methods:

• Twenty-one patients with CU, twenty with other urticarias, and seventeen healthy controls underwent skin testing with histamine, compound 48/80, acetylcholine, and kallikrein.
• Bronchial challenge tests with acetylcholine were performed.
• Cutaneous weal size and pulmonary resistance changes were measured.

Main Results:

• Severely affected CU patients and those with other severe urticarias exhibited larger skin weals upon histamine injection compared to controls and moderate cases.
• Only severely affected CU patients showed a significant increase in pulmonary resistance during acetylcholine bronchial challenge.
• No correlation was found between individual cutaneous and pulmonary reactivity.

Conclusions:

• Patients with severe cholinergic urticaria display heightened skin reactivity, similar to other urticaria types, and distinct increased bronchial reactivity.
• This dual hypersensitivity in CU patients suggests a complex inflammatory response involving both skin and airways.